58 
PAN-PACIFIC ENTOMOLOGIST 
Figs. 1 and 2. Usumbaraia arnaudi n. sp., 9. Fig. 1, Head, pronotum and mesonotum; 
Fig. 2, Tip of abdomen, from above. 
groove transversely rugose and with 2 (1 + 1) longitudinal carinae sublat- 
erally. 
Pronotum. —Subrectangular, shorter than its maximum width across 
posterolateral angles (35:75) anterio-lateral angles rounded. Collar robust 
and sinuate anteriorly, fused posteriorly with a stout, transverse ridge. Be¬ 
tween collar and anterior borders 2(1 + 1) deep, rounded incisions. Ante¬ 
rior borders evenly rounded, forming an arc with lateral borders. Hind 
border slightly convex medially and sinuate laterally. Disc with a deep me¬ 
dian sulcus extending from transverse ridge to hind border, flanked by 
2 (1 + 1) large, flat, round elevations and further laterad with 2 (1 + 1) 
